That is the entire point here. iPhones are no longer "unserviceable". They are selling the parts so you can service it yourself.
What exactly is your complaint? That they are not as easy to service as your old flip phone? The modern iPhone has more computational power and technology packed into it than a full size desktop computer from 3 years ago. Modern phones are so much more than just a phone and will never be as easy to service as your old flip phone. No tech company will ever satisfy your complaint if that is what you truly desire.
What exactly is your complaint? That they are not as easy to service as your old flip phone? The modern iPhone has more computational power and technology packed into it than a full size desktop computer from 3 years ago. Modern phones are so much more than just a phone and will never be as easy to service as your old flip phone. No tech company will ever satisfy your complaint if that is what you truly desire.